25.4 mm = 1 inch
18.5 mm = 0.728 inch (rounded)
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To be accurate, use a mini tape measure and only measure when you are erected and i mean when you are as stiff as rock and it will be better if u let someone else measure it as they won't lie to you
15 to 17 inches
they were 18 meters 4.8 inches
They come in various sizes, but a typical abacus is about eight inches square.
by a big long stik with numbers on the end